Improved f fruit-jar



UNITED STATES PATENT OFFICE..

JoHN EooEE, or cLAssBoEoUeH, NEW JEHsEY, AssicNoH To TTH. AND s. A. WHITNEY, or SAME PLAcE.

lIMPROVED FRUIT-JAR.

Specification forming part of Letters Patent No. 55,581, dated June 12, 1866.

To all whom it may concern:

Be it known that I, JOHN FocER, of Glassborough, Gloucester county, New Jersey, have invented an Improvement in Air-Tight Jars; and I do hereby declare the following to be a full, clear, and exact description of the same, reference bein g had to the accompanyingdrawings, and to the letters of reference marked thereon.

My invention consists of a ring of thin metal having screwthreads adapted to similar threads on thc glass cover and thc neck of a preserving-jar, all substantially as described hereinafter, so as to aiord a simple and economical mode of securing the cover to the jar and of compressing between the two a ring of gumelastic.

In order to enable others skilled in the art to make and use my invention, I will nowprooecd to describe its'construction and operation.

0n reference to the accompanying drawings, which form a partot' this specification, Figure 1 is a vertical section, of part of' an air-tightjar with my improvement; Fig. 2, an exterior view of the neck of the jar; and Fig. 3, a sectional plan on the line 1 2, Fig. l.

Similar letters refer to similar parts throughout the several views.

.A is the neck of the jar, and B the cover, which has an annular tiange, b, arranged to tit snugly over an annular lian ge, a, forming the mouth of the jar. This iian ge a terminates at a shoulder, d, between which and the end of the annular flange b of the cover intervenes a ring of gunrelastic or other equivalent material.

Screw-threads e are formed on the exterior of the cover, and similar threads f on the exterior of the neck of the jar.

D is a ring of thin metal, (ordinary tinned plates will serve the desired purpose,) and in this ring are formed screw-threads adapted to those on the cover and neck of the vessel. This screw-ring is iirst applied to the cover by turning it on the same until its upper edge reaches the projecting ange b of the cover, after which the remaining portion of the screwring is applied to the neck of thejar by turning the cover round until the gum-elastic ring is so far compressed as to form a perfectlytightjoint.

As the screw-threads can be formed on the glass cover and jar during the process of making the same with but little trouble and expense, and as the tin ring can have its screwthreads readily formed by suitable rolling machinery, it will be evident that my improved cover for preserving-jars possesses the advantage of simplicity and economy.

Should there be any slight inequalities in the screwed portions of the cover and jar, they will not interfere with the proper adjustment of the cover, inasmuch as the metal ring is so thin as to readily yield to slight irregularities.

I claim as my invention and desire to secure by Letters Patent- The thin metal ring D, having screw-threads adapted to similar threads on the cover B and neck A of a preserving-jar, all substantially as and for the purpose herein set forth.

1n testimony whereof Ihavesigned my name to this specification in the presence of two subscribing witnesses.

JOHN FOCER.

Witnesses:

EDWARD T. LUTZ, JOHN AMADOUN. 

